I know that this might sound like a silly idea, but when Fay refered to that whole taking out thing. Maybe he meant that Ashura took him out from within himself. Like maybe Fay had been like this before (you know afraid of trusting, fake smiles and what not) and Ashura had helped him to be more open and trusting only for it to be a lie (For some reason still unknown to us all) in the end and betray Fay's trust.
What I'm saying is, that I think Fay had to have had some practice, nobody can be that good at hiding their feelings just minutes after they sealed away someone important to them. Also Fay is pretty old, who knows how old. Who's to say that there wasn't someone even before Ashura?
I don't know, but those are just my two cents. Maybe Fay really was locked in some closet and now he's out? Sorry about that XD
But what Fay did to Kurogane isn't acceptable. The poor man looked so hurt. Kinda like a teenager getting their love letter throw right back at them with a stamp of rejection in bold letters.Â
He even went as far as run/move away from Fay, like he couldn't handle the situation, this a first for him when it comes to Fay.
I think I'm going to go comfort my Kuro plushie now....